HSD17B13-IN-42 (compound 10)? is a ppotent inhibitor of hydroxysteroid 17?-dehydrogenase 13 (HSD17B13) , with the IC 50 of < 0.1 μM? estradiol? as substrates. HSD17B13-IN-42? plays an important role in nonalcoholic fatty liver diseases (NAFLDs) including NASH (nonalcoholic steatohepatitis).